Flash CM 10.1.0 Stable ROM for T-Mobile Samsung Galaxy S3 T999

Flash CM 11 Snapshot KitKat M4 for Galaxy S2

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T-Mobile Samsung Galaxy S3 has received its own version of CM 10.1.0 Stable builds. You can use this tutorial and learn how to successfully install it on your device without bricking it.

CyanogenMod 10.1.0 Stable is an update for the Nightlies, M Snapshot and Release Candidate versions of CM 10.1. It is still based on AOSP Android 4.2.2 Jelly Bean and in order to correctly install it, you will first need to read the preparation guide below:

  • use this post only with the T-Mobile Samsung Galaxy S3 model number T999.
  • don’t attempt to update any other Galaxy S3 phone’s using this guide, as you will end up bricking it.
  • your device has to be factory unlocked, rooted and running CWM or TWRP Recovery.
  • I’ve used ClockworkMod – CWM Recovery for this tutorial, but the TWRP one will work too.
  • use the custom Recovery mode and create a full NANDROID backup of your currently installed ROM. This will act as a restore OS file and it can be used in case your device doesn’t boot with the new OS.
  • the tutorial contains a step that tells you to wipe data and factory reset your smartphone before installing any new ROM files. This step is required as otherwise your phone might not boot CM 10.1.0.
  • if your device is already running a previous build of CM 10.1, you will still have to factory reset it.
  • factory reset will wipe the contents from your phone’s system partition, which is why you lose installed apps, SMS and other similar data.
  • in order to backup installed apps, you will need to look for a working tool on Google Play Store.
  • if you want to save SMS, Call logs info and APN Internet Settings then you can try to use these tools for Android devices: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore. Root access is needed for some of these applications.
  • sync your Contacts info using the Gmail account that you’ve assigned as default for your smartphone.
  • enable USB Debugging from Developer Options.
  • make sure that your phone has enough power left in its battery before moving to the tutorial guide.
  • this is a guide for advanced Android users and you should apply all the steps that are listed below.
  • we cannot be blamed in case you lose any important files or your device gets bricked in the process.

Since you’ve read all of the above, I think that you can continue to the next part of this article and learn how to successfully flash the latest CM build for your Android device.

How to flash CM 10.1.0 Stable Build for T-Mobile Samsung Galaxy S3 T999:

  1. Download the CM 10.1.0 Stable zip file from HERE.
    > don’t unzip the file, save it on your PC.
  2. Download Gapps for Jelly Bean 4.2.2 / CM 10.1 ROMs from HERE.
    > save it on your PC and don’t unzip.
  3. Connect your smartphone with your computer and then move both files on your phone’s internal SDcard. When the files are successfully moved, you will need to disconnect the SGS3 from PC.
  4. Switch off your Galaxy S3 T-Mobile phone.
  5. Boot the device into CWM or TWRP Recovery Mode.
    > note that both Recovery images will work with this tutorial, but this one is based on CWM.
    > make sure to apply the correct actions on TWRP and if you have any problems, ask for help in comments.
  6. Select ‘backup and restore’ option from the first screen of Custom Recovery Mode. Create a NANDROID backup of your current OS right now and then continue to the next step.
  7. Next, select ‘wipe data/ factory reset’. Confirm this process.
    > even if your phone is already using a previous build of CM 10.1, you still need to apply the ‘factory reset’, as otherwise your device might not boot into normal mode.
  8. Go back to the main Custom Recovery mode menu. Select ‘install zip from sdcard’.
  9. After that you need to select ‘choose zip from sdcard’. Find the CM 10.1.0 Stable zip and confirm its installation. This shouldn’t take more than a couple of minutes.
  10. When CM 10.1.0 ROM is installed, you will need to select again ‘choose zip from sdcard’. Now find the Gapps zip and install this one too.
  11. After both CM 10.1.0 and Gapps files have been installed successfully, select ‘reboot system now’ from the main Recovery mode screen.
  12. CyanogenMod 10.1 Stable ROM now starts its first boot process and this shouldn’t take more than 5 minutes to complete. Enter your Google Account credentials when its home screen appears.

NOTE: If the first boot process takes too long to complete, then you will be forced to power off your smartphone completely. After that you will need remove its battery and re-insert it after 5 seconds have passed. Then, you have to repeat the entire tutorial starting with step 5. This time you need to make sure that you won’t skip any steps listed above and make sure to apply ‘factory reset’.

I hope that you’ve managed to update your T-Mobile Samsung Galaxy S3 with this latest build of CM 10.1.0 Stable Jelly Bean 4.2.2 ROM.

In case you don’t like how this new ROM works with your device, then you can still use the Custom Recovery Mode to restore the NANDROID backup of your previously installed OS.

Make sure that you will test all the new functions of CyanogenMod 10.1.0 Stable ROM and then you can tell us in comments how’s your device working with it.